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Category: Consciousness

The spirit molecule

The spirit molecule

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Graham St John writes: Identified in 300 BCE by the Greek physician Herophilos as the brain’s only unpaired organ, the pineal gland has long been a source of mystery and speculation. Galen, another Greek physician and philosopher, discussed its role as a valve regulating the flow of ‘psychic pneuma’. This view informed René Descartes, who in the 17th century situated the soul (for him, the mind) precisely in this tiny mid-brain structure, which he imagined to be something of a…

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A revolution in our sense of self

A revolution in our sense of self

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Nick Chater writes: At the climax of Anna Karenina, the heroine throws herself under a train as it moves out of a station on the edge of Moscow. But did she really want to die? Had the ennui of Russian aristocratic life and the fear of losing her lover, Vronsky, become so intolerable that death seemed the only escape? Or was her final act mere capriciousness, a theatrical gesture of despair, not seriously imagined even moments before the opportunity arose?…

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How new data is transforming our understanding of place cells — the brain’s GPS

How new data is transforming our understanding of place cells — the brain’s GPS

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Adithya Rajagopalan writes: The first pieces of the brain’s “inner GPS” started coming to light in 1970. In the laboratories of University College London, John O’Keefe and his student Jonathan Dostrovsky recorded the electrical activity of neurons in the hippocampus of freely moving rats. They found a group of neurons that increased their activity only when a rat found itself in a particular location. They called them “place cells.” Building on these early findings, O’Keefe and his colleague Lynn Nadel…

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Plants, people, and decision-making

Plants, people, and decision-making

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Laura Ruggles writes: Plants are not simply organic, passive automata. We now know that they can sense and integrate information about dozens of different environmental variables, and that they use this knowledge to guide flexible, adaptive behaviour. For example, plants can recognise whether nearby plants are kin or unrelated, and adjust their foraging strategies accordingly. The flower Impatiens pallida, also known as pale jewelweed, is one of several species that tends to devote a greater share of resources to growing…

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